Comments, etc. are cached with the entry. This is when data
is being loaded
in the cache.
On 12/4/06 12:55 PM, "ogjunk-blojsom yahoo.com" <ogjunk-blojsomyahoo.com>
wrote:
>> From that thread dump, it looked like it might be
the way Blojsom is calling
>> OSCache that's the problem, but maybe I
misinterpreted the output.
> I think there are a few other places where there's room
for optimization,
> although I'm not sure about the priority of this stuff
now that 3.* is based
> on DB, and not FS any more:
>
> "Thread-402" daemon prio=1 tid=0x6fc29eb0
nid=0x731c runnable
> [0x68afc000..0x68afcf30]
> at
java.io.UnixFileSystem.getLastModifiedTime(Native Method)
> at java.io.File.lastModified(File.java:795)
> at
org.blojsom.util.BlojsomUtils$1.compare(BlojsomUtils.java:10
24)
> at java.util.Arrays.mergeSort(Arrays.java:1307)
> at java.util.Arrays.mergeSort(Arrays.java:1296)
> at java.util.Arrays.mergeSort(Arrays.java:1296)
> at java.util.Arrays.mergeSort(Arrays.java:1296)
> at java.util.Arrays.sort(Arrays.java:1223)
> at
>
org.blojsom.blog.FileBackedBlogEntry.loadComments(FileBacked
BlogEntry.java:226>
)
> at
>
org.blojsom.blog.FileBackedBlogEntry.load(FileBackedBlogEntr
y.java:528)
> at
>
org.blojsom.fetcher.StandardFetcher.getEntriesForCategory(St
andardFetcher.java
> :231)
> at
>
org.blojsom.fetcher.StandardFetcher.getEntriesAllCategories(
StandardFetcher.ja
> va:335)
> at
>
org.blojsom.fetcher.CachingFetcher$AllCategoriesFetcherThrea
d.run(CachingFetch
> er.java:415)
> - locked <0x77797fe0> (a
>
com.opensymphony.oscache.general.GeneralCacheAdministrator)
> at java.lang.Thread.run(Thread.java:595)
>
>
> Those java.io.* calls show we are hitting the FS, and
those two .load* method
> calls are frequently seen in my thread dumps. That is
likely because
> blog.simpy.com has a pretty busy FS, so things get slow
in there. I'd imagine
> you'd want to cache comments, though, as they typically
don't change that
> frequently, expiring them only when a new comment gets
added, perhaps. Maybe
> that's already doable, and I just haven't configured it
properly to cache
> comments, too?
>
> Otis
>
>
> ----- Original Message ----
> From: David Czarnecki <davidblojsom.com>
> To: blojsom-users <blojsom-userslists.sourceforge.net>
> Sent: Monday, December 4, 2006 11:33:44 AM
> Subject: Re: [Blojsom-users] Resource contention bug?
>
> The OSCache references in the lock waiting make me
think it's an issue with
> OSCache. D'you try using OSCache 2.3.2?
>
> <h
ttp://opensymphony.com/oscache/download.action>
>
> On 12/4/06 12:20 AM, "ogjunk-blojsomyahoo.com" <ogjunk-blojsomyahoo.com>
> wrote:
>
>> Hi,
>>
>> This may be just something for Dave to look at, but
maybe others would be
>> interested, too. I run Blojsom 2.30 at http://blog.simpy.com/
under Jetty.
>> I've noticed that right after I restart the servlet
container the load shoots
>> up, so I decided to see what the JVM is doing with
kill -QUIT . I did that
>> on
>> a few occasions and often saw Blojsom in states
like these:
>>
>>
>> Full thread dump Java HotSpot(TM) Server VM
(1.5.0_08-b03 mixed mode):
>>
>> "Thread-410" daemon prio=1 tid=0x6cbc3cd8
nid=0x4f21 runnable
>> [0x5e2f6000..0x5e2f6fb0]
>> at
sun.nio.cs.UTF_8$Encoder.encodeArrayLoop(UTF_8.java:460)
>> at
sun.nio.cs.UTF_8$Encoder.encodeLoop(UTF_8.java:575)
>> at
java.nio.charset.CharsetEncoder.encode(CharsetEncoder.java:5
44)
>> at
java.lang.StringCoding$CharsetSE.encode(StringCoding.java:34
2)
>> at
java.lang.StringCoding.encode(StringCoding.java:378)
>> at
java.lang.String.getBytes(String.java:812)
>> at
java.io.UnixFileSystem.getLastModifiedTime(Native Method)
>> at java.io.File.lastModified(File.java:795)
>> at
org.blojsom.util.BlojsomUtils$1.compare(BlojsomUtils.java:10
23)
>> at
java.util.Arrays.mergeSort(Arrays.java:1307)
>> at
java.util.Arrays.mergeSort(Arrays.java:1296)
>> at
java.util.Arrays.mergeSort(Arrays.java:1296)
>> at java.util.Arrays.sort(Arrays.java:1223)
>> at
>>
>
org.blojsom.blog.FileBackedBlogEntry.loadComments(FileBacked
BlogEntry.java:226>
>
> )
>> at
>>
org.blojsom.blog.FileBackedBlogEntry.load(FileBackedBlogEntr
y.java:528)
>> at
>>
org.blojsom.fetcher.StandardFetcher.getEntriesForCategory(St
andardFetcher.jav>>
a
>> :231)
>> at
>>
org.blojsom.fetcher.StandardFetcher.getEntriesAllCategories(
StandardFetcher.j>>
a
>> va:335)
>> at
>>
org.blojsom.fetcher.CachingFetcher$AllCategoriesFetcherThrea
d.run(CachingFetc>>
h
>> er.java:415)
>> - locked <0x74595af0> (a
>>
com.opensymphony.oscache.general.GeneralCacheAdministrator)
>> at java.lang.Thread.run(Thread.java:595)
>>
>> "Thread-409" daemon prio=1 tid=0x6c55f550
nid=0x4f20 waiting for monitor
>> entry
>> [0x5e377000..0x5e377f30]
>> at
>>
org.blojsom.fetcher.CachingFetcher$AllCategoriesFetcherThrea
d.run(CachingFetc>>
h
>> er.java:414)
>> - waiting to lock <0x74595af0> (a
>>
com.opensymphony.oscache.general.GeneralCacheAdministrator)
>> at java.lang.Thread.run(Thread.java:595)
>>
>> "Thread-408" daemon prio=1 tid=0x6222bf60
nid=0x4ef0 waiting for monitor
>> entry
>> [0x5e3f8000..0x5e3f8eb0]
>> at
>>
org.blojsom.fetcher.CachingFetcher$AllCategoriesFetcherThrea
d.run(CachingFetc>>
h
>> er.java:414)
>> - waiting to lock <0x74595af0> (a
>>
com.opensymphony.oscache.general.GeneralCacheAdministrator)
>> at java.lang.Thread.run(Thread.java:595)
>>
>> ....
>>
>> Note Thread-409|408, Dave. I often see dozens of
these locked at the exact
>> same point/line. I haven't looked at the source,
but it feels like some
>> resource contention issue that you may want to
investigate.
>>
>> Otis
>>
>>
>>
>>
>>
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--
David Czarnecki
http://www.blojsom.com/b
log/ | http://blojsom.sf.net
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